Balanced slide-valve.



F. BARNGROVER & E. A. EUSTIGE. BALANCED SLIDE VALVE. APPLICATION FILED HAY14, 1907.

907, 1 1 7. Q Patented Dec. 22, 1908.

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UNITED STATES PATENT onrucn.

FRANK BARNGROVER, OF PAGKWOOD, AND EDWARD A. EUSTICE, OF NEWTON, IOWA.

BALANCED SLIDE-VALVE.

Specification of Letters Patent.

Patented Dec. 22, 1908.

To all whom iii/nay concern:

Be it known that we, FRANK BARNGROVER, a citizen of the United States, residing at Packwood, in the county of Jefierson and State of Iowa, and EDWARD A. EUSTICE, a citizen of the United States, residing at Newton, in the county of Jasper and btate of Iowa, have invented a certain new and useful Balanced Slide-Valve, of which the following is a specification.

The object of our invention is to provide a balanced slide valve of simple, durable and inexpensive construction, in which the steam pressure within the steam chest may be substantially balanced as applied to the valve, to thereby relieve the valve of all excessive pressure tending to force it against the valve seat, allowing only as much pressure in a direction toward the valve seat as is necessary to hold the valve to its seat, and prevent leakage of steam around the valve, to the induction and exhaust ports of the cylinder.

A further object is to provide a valve of this kind especially adapted to be substituted for ordinary slide valves in steam chests of different sizes and shapes, so that the valve itself may be sold to persons having engines provided with ordinary slide valves, and quickly and easily substituted for the ordinary slide valves without any change in the steam chest.

Our invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in our claim, and illustrated in the accompanying drawings, in Which- Figure 1 shows a horizontal central sectional view through a valve seat, a steam chest, and a valve embodying our invention. Fig. 2 shows a vertical sectional view of a steam chest having our improved valve therein, the end of the valve appearin in elevation. Fig. 3 is a side view of one of the connecting blocks.

Referring to the accompanying drawings, we have used the reference numeral 10 to indicate the valve seat having the induction ports 11 and the exhaust port 12. The steam chamber comprises the side walls 11*, and the outer plate 12, detachably connected with the sides by the bolts 13. The numeral 14 indicates a valve stem passed through the packing box 15, at one end of the steam chamber. All of these parts are of the ordinary construction, and form no part of our present invention.

The valve proper comprises a body portion 16 having its inner face designed to slide on the valve seat 10, and provided with a chamber 17, to provide communication between one of the ports 11, and the port 12, for exhausting steam from the cylinder. On the outer face of the body portion 16 of the valve, are two connecting pieces 18, which are formed integral with a circular pressure plate 19, which is spaced apart from the valve body 16 by the connecting pieces 18. Formed in the periphery of the pressure plate 19 is an annular groove 20, to receive a metal packing ring 21, of the ordinary construction. Mounted upon the pressure plate 19, is a collar 22 surrounding the periphery of the pressure plate, and having its outer edge designed to rest against the valve cover 12 An annular shoulder 23 is formed in the collar 22, to engage the outer face of the pressure plate 19, to thereby limit. the

movement of the collar 22 in a direction.

away from the valve cover 12".

We provide for connecting the valve stem I with the valve as follows: Two connecting blocks 24.- are provided, and have lugs 25 thereon. They also have central openings. One block is placed on each side of the connecting pieces 18, with the lugs 25 projecting between said connecting pieces. Then the valve stem 14 is passed through the blocks 24:, and between the connecting pieces 18, and the adjusting nuts 26 are placed on the valve stem and turned to clamp the blocks 24: firmly against the connecting pieces 18. At the bottom of the valve chamber, near its outer portion, we have fixed a guide block 27, upon which the collar 22 may rest, to thereby hold the valve accurately in position during its longitudinal movement.

Our valve may be adapted for use in connection with valve stems that are placed at different distances from the valve seat, and all that is necessary in order to make the valve stem aline perfectly with the valve, is to properly adjust the blocks 24 upon the connecting pieces 18, and then tighten the nuts 26.

In practical use, we first remove the ordinary slide valve from the steam chest, and then place our improved valve therein, and

connect the valve stem with it in the manner described. The collar 22 will be in engagement with the valve cover 12, and in this connection it is to be noted that the collar 22 as shown in Fig. 1, would engage the valve cover, even if the cover were moved outwardly a slight distance further than the cover shown in the drawings, hence, the valve will fit in steam chests of different sizes. However, in the event that the valve cover is spaced apart from the valve seat an unusually great distance, it is only necessary to provide a new collar 2:2, of greater length than the one shown in the drawings.

Assuming that steam is admitted into the interior of the valve chamber, it will obviously press upon the body of the valve in a direction tending to force it against the valve seat, and will also press upon the pres sure plate 19 in a direction tending to force it away from the valve seat. At the same time, there will be a considerable pressure upon the inner face of the collar 22 tending to hold it firmly in engagement with the inner surface of the valve cover, to thereby prevent leakage of steam between the valve cover and the collar 22. Leakage of steam between the pressure plate 19 and the collar 22 is prevented by the packing ring 21. In this connection it is to be understood that the exposed area of the valve body 16 is slightly greater than the exposed area of the pressure plate 19, so that the valve body will always be held against its seat with a slight pressure, su'tiicient to prevent leakage of steam. By providing the pressure plate 19 that is permitted a slight movement relative to the collar 22, we accomplish the desired result of always holding the valve flat against the valve seat, and also holding the collar 22 flat against the cover 12, and by the arrangement shown for connecting the valve with the valve stem 14-, the valve may be adjusted relative to the valve seat in the manner required for effective results.

Having thus described our invention, what we claim and desire to secure by Letters Patent of the United States, therefor, is-

The herein described balanced slide valve, comprising a steam chest having in one of its walls an exhaust port and induction port-s disposed at opposite sides of said exhaust port, a chambered valve body s'lida'ble against said wall of the chest, a collar slidab'le against the opposite wall of the chest, a pressure plate movable in said collar, a pair of parallel connecting port-ions spaced apart and interposed between and fixed with respect to the valve body and the pressure plate, a stem extending through one end wall of the chest and also through the space between said connecting portions and having threaded portions and nuts mounted thereon and disposed at opposite sides of the pair: of connecting portions, and connecting blocks 24 mounted on the stem between opposite sides of the pair of connecting portions and the said nuts and having lugs 25 disposed in the space between the connecting portions, as and for the purpose set forth.

Des Moines, lowa, May 1, 1907.

FRANK BARNGROVER. EDlVARD A. EUSTIGE.

Vvituesses E. M. JOHNSTON, E. A. MILLER, H. C. Konr, FRED PAI-IRE. 

